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the ENGINE RUN switch has been momentarily selected to OFF then reselected to
ON.
The Quick Relight functionality is defined as follows:
• Enabled only if in-flight
• Activated when ENGINE RUN switch is reselected ON within 30 seconds after
selecting ENGINE RUN switch to OFF and N2 greater than or equal to Idle (42%
N2)
• When Quick Relight activated, fuel is commanded ON and both ignition systems
ON
If N2 continues to fall below Idle speed, Quick Relight will maintain both the ignition
systems and fuel ON until the engine speed is regained for up to 20 seconds.
The crew can cancel Quick Relight by selecting the ENGINE RUN back to OFF.
GX_17_074
L ENGINE FLAMEOUT
For Training Purposes Only
Sept 04
17-51
P I LOT T R A I N I N G GU I D E
POWER PLANT
AUTOTHROTTLE SYSTEM
The autothrottle system performs the following functions:
• Operation over the full range of available forward thrust for two engine operation.
The autothrottle will not operate under single engine conditions
• Hands-off operation from takeoff to landing
• Engine synchronization
• Electronic Thrust Trim System (ETTS)
The A/T has two basic modes of operation:
1. Thrust control for the following AP/FD modes:
- T/O (Takeoff)
- GA (Go Around)
- WS (Windshear)
- FLC (Flight Level Change)
2. Speed control
- For all other Flight Director modes
Note that the default operation for the A/T is speed control when no AP/FD modes are
active.
AUTOTHROTTLE (A/T) DATA SOURCES
The A/T selects the IRS displayed on the coupled PFD as the IRS source during nondual
coupled AP/FD operation. During dual coupled AP/FD operation A/T selects the
IRS displayed on each PFD and averages the data.
The A/T selects the ADC displayed on the coupled PFD as the ADC source during
non-dual coupled Autopilot/Flight Director (AP/FD) operation. During dual coupled
AP/FD operation A/T selects the ADC displayed on each PFD and averages the data.
A/T LIMITING
The A/T system provides speed and thrust envelope limiting. Thrust envelope limiting
is based on the active EPR rating, while speed envelope limiting is based on minimum
speed limits as well as placard and structural speed limits.
17-52 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
POWER PLANT
A/T MONITORING
Monitoring is incorporated in the A/T system to ensure control integrity. The
monitoring consists of validity, servo response and pilot override monitoring. Validity
monitoring ensures that all parameters required for A/T control, during a specific
phase of flight, are present and valid and detects engine out, engine reversion, thrust
reverser deployment and internal faults. The servo response monitor compares the
servo response with the commanded response to ensure the integrity of the servo
control system. The pilot override monitor detects pilot movement of the thrust levers
while the A/T system is engaged, to provide automatic disconnect of the A/T system.
ELECTRONIC THRUST TRIM SYSTEM (ETTS)
The electronic engine trim system will command limited authority thrust. The trim
system will perform trimming to assist the A/T as well as the crew at setting trimmed
thrust. In addition, the system will perform N1/N2 synchronization when selected by
the crew. The engine trim operating mode (N1 SYNC, N2 SYNC, EPR CMD SYNC
and NO SYNC) are selectable via the FMS CDU. Only one operating mode can be
active at a time. Selection of an operating mode arms the Sync system for engagement,
when the conditions and flight phase are appropriate.
GX_17_001
CHAN
A
CHAN
B
EEC
THRUST
No.1
ENGINE
AIRFRAME
ENGINE
EPR ACTUAL
EPR COMMAND
EPR MAX
EPR TRA
EPR IDLE
N1 (TO ADJUST
N2 THE ENGINES)
IAC
DAU
EICAS
NOTE
Thrust reverser levers
omitted for clarity
THROTTLE
SERVO
THROTTLE
SERVO
EPR/TRA
TRIM
THROTTLE
ANGLE INC DEC INC DEC
No. 1
THROTTLE
No. 2
THROTTLE
FORWARD
AUTOTHROTTLE
SELECTION
CONTROL
EPR DISPLAY
PARAMETERS
CHAN
A
CHAN
B
No. 1 RVDT
Autothrottle
Quick
Disconnect
Switch
For Training Purposes Only
Sept 04
17-53
P I LOT T R A I N I N G GU I D E
POWER PLANT
SYNC MODE SELECTION
The engine synchronization (SYNC) function is selected automatically by the
autothrottle system (if engaged), or manually via the FMS. SYNC system will
compare engine speeds and compute a trim value in order to match the two engine
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